Non-tacky photocrosslinkable cosmetic composition

ABSTRACT

The present invention relates to a photocrosslinkable cosmetic composition, comprising in a physiologically acceptable medium: —at least one photocrosslinkable urethane (meth)acrylate compound P1 comprising at least one structural unit: (I) —at least one photocrosslinkable urethane (meth)acrylate compound P2 comprising at least one polyether chain, said compound having a molar mass greater than or equal to 1000 g/mol, —at least one film-forming polymer P3, —at least one photoinitiator, and —at least one volatile solvent chosen from acetone, ethyl acetate, and propyl acetate, said solvent being present in said composition at a content greater than or equal to 20%, preferably greater than or equal to 30%, by weight in relation to the total weight of said composition, wherein the ratio of the total mass of P1 and P2 to the total mass of P3 is less than or equal to 4.0.

The present invention relates to a photocrosslinkable cosmeticcomposition, particularly for nail and/or false nail makeup and/or care.

More particularly, the present invention relates to a photocrosslinkablenail varnish composition.

The present invention also relates to a nail and/or false nail makeupand/or care method using said composition.

Nail varnish compositions may be used as a base for the varnish (orbase-coat), as a nail makeup product, or as a finishing composition (ortop-coat) to be applied on the nail makeup product, or as a cosmeticnail care product. These compositions may be applied onto natural nailsas well as onto false nails.

In the field of nail varnishes, liquid cosmetic compositions are known,which are used by first applying a coat onto the nail and thensubjecting said coat to the action of light radiation, inducing in situpolymerization and/or crosslinking reactions within said coat, resultingin generally crosslinked polymeric networks. Such photocrosslinkablecompositions, commonly referred to as “UV gels” and generally based oncrosslinkable (meth)acrylate compounds, are suitable for obtaining asatisfactory stability of the coat applied on the nail, and aredescribed for example in CA 1 306 954, U.S. Pat. No. 5,456,905, U.S.Pat. No. 7,375,144 and FR 2 823 105.

However, the oxygen in air induces the inhibition of the radicalpolymerization and/or crosslinking reaction on the coat surface incontact with air, resulting in the formation of a tacky layer ofunreacted (meth)acrylate compounds on the surface of said coat.Following the crosslinking step, cleaning of the coat surface withisopropanol for example (commonly referred to as “degreasing”) is thusnecessary to remove said tacky layer. This represents a drawback sinceit adds an additional step for nail or false nail makeup.

Moreover, if the tacky layer is not cleaned properly, sensitizingunreacted (meth)acrylate compounds may remain on the nails, false nailsand skin.

The aim of the present invention is to provide a novelphotocrosslinkable composition having satisfactory rigidity, stabilityand gloss properties, which is easy to use, but does not have thedrawbacks of the photocrosslinkable cosmetic compositions according tothe prior art.

In particular, the aim of the present invention is to provide aphotocrosslinkable composition not having a tacky surface after thecrosslinking step.

Another aim of the present invention is to provide a photocrosslinkablecomposition comprising a low proportion of sensitizing (meth)acrylatecompounds.

Another aim of the invention is to obtain photocrosslinkablecompositions suitable for providing coats having the followingproperties: stability over time (with a mild etching or without anyetching of the nail or false nail before applying the composition), easymakeup removal, high cosmeticity, outstanding makeup result (homogeneousdeposition, easy to apply, comfortable to wear) and/or high gloss.

The present invention relates to a photocrosslinkable cosmeticcomposition, comprising in a physiologically acceptable medium:

-   -   at least one photocrosslinkable urethane (meth)acrylate compound        P1 comprising at least one structural unit:

-   -   at least one photocrosslinkable urethane (meth)acrylate compound        P2 comprising at least one polyether chain, said compound having        a molar mass greater than or equal to 1000 g/mol,    -   at least one film-forming polymer P3,    -   at least one photoinitiatorphotoinitiator, and    -   at least one volatile solvent chosen from acetone, ethyl        acetate, and propyl acetate, said solvent being present in said        composition at a content greater than or equal to 20%,        preferably greater than or equal to 30%, by weight in relation        to the total weight of said composition,        wherein the proportion of (meth)acrylate monomers is preferably        less than or equal to 10% by weight in relation to the total        weight of said composition, and wherein the ratio of the total        mass of P1 and P2 to the total mass of P3 is less than or equal        to 4.0.

The cosmetic compositions according to the invention comprise aphysiologically acceptable medium.

The term “physiologically acceptable medium” refers to a medium that isparticularly suitable for the application of a composition of theinvention onto keratin matter.

The physiologically acceptable medium is generally suitable for thenature of the support to which the composition should be applied, andalso for the way in which the composition is to be packaged.

The term “(meth)acrylate monomer” refers to a compound comprising asingle (meth)acrylate function according to the formulaH₂C≡C(R)—C(O)—O—, where R═H or CH₃.

According to one embodiment, the photocrosslinkable compositionaccording to the invention comprises a reduced proportion of(meth)acrylate monomers, i.e. less than 10% by weight in relation to thetotal weight of said composition. Preferably, this proportion is lessthan or equal to 5%, preferentially less than or equal to 1% by weight.Advantageously, the composition according to the invention is completelyfree from (meth)acrylate monomer.

The term “photocrosslinkable compound” refers to an organic compoundsuitable for crosslinking under the action of a light ray, resulting ina crosslinked polymer network.

Preferably, the film-forming polymer P3 is a non-photocrosslinkablecompound.

The term “non-photocrosslinkable compound” refers to a compound inert toany light exposure, i.e. that does not polymerize and/or is notcrosslinked, unlike the photocrosslinkable compounds P1 and P2.

In particular, the film-forming polymer P3 is generally free from doubleethylene bonds, such as (meth)acrylate groups.

In the composition according to the invention, the ratio of the totalmass of P1 and P2 to the total mass of P3 is less than or equal to 4.0.

Surprisingly, the inventors observed that a photocrosslinkablecomposition according to the invention comprising the combination of thecompounds P1 and P2 and the film-forming polymer P3, observing the massratio defined above, is suitable for obtaining a crosslinked coat,consisting of said photocrosslinkable composition, not having a tackysurface, but having satisfactory rigidity, stability and glossproperties, however.

Without seeking to be associated with a particular theory, the inventorsobserved that, once crosslinked, the photocrosslinkable compound P1makes it possible to increase the rigidity of said coat.

In the composition according to the invention, the mass ratio between P1and P2 typically ranges from 0.5 to 2.5, preferably from 1.0 to 2.0,advantageously from 1.25 to 1.75.

Urethane (Meth)Acrylate Compound

The term “urethane (meth)acrylate compound” refers to any compoundcomprising at least one urethane function —O—C(O)—NH—, and at least one(meth)acrylate function according to the formula H₂C═C(R)—C(O)—O—, whereR═H or CH₃.

The “urethane” function is also referred to as a “carbamate” function.

Photocrosslinkable Compound P1

The composition according to the invention comprises at least one firstphotocrosslinkable compound, referred to as P1, which is a urethane(meth)acrylate compound and which comprises at least one structuralunit:

The photocrosslinkable compound P1 preferably is of general formula:

where R_(i) and R_(ii) are identical or different groups, eachrepresenting a C₁-C₆ alkyl group substituted with one or a plurality of(meth)acrylate groups, or a polyurethane group, comprising 2 to 20urethane units, said polyurethane being substituted by one or aplurality of (meth)acrylate groups.

The term “polyurethane group” refers to a group obtained frompolymerizing a mixture of monomers comprising isocyanate functions andmonomers comprising alcohol functions.

According to one embodiment, the photocrosslinkable compound P1 ischosen from the group consisting of urethane poly(meth)acrylatecompounds, advantageously in the group consisting of urethanedi(meth)acrylate compounds, preferably in the group consisting ofurethane dimethacrylate compounds.

According to the present invention, the term “poly(meth)acrylatecompound” refers to a (meth)acrylate compound comprising a plurality of(meth)acrylate functions.

In this way, the term “poly(meth)acrylate compound” may refer to acompound comprising at least two methacrylate functions, or at least twoacrylate functions, or at least one methacrylate function and at leastone acrylate function.

Preferably, the photocrosslinkable compound P1 is a urethanedimethacrylate compound.

The term “urethane dimethacrylate compound” refers to any compoundcomprising at least one urethane function —O—C(O)—NH—, and twomethacrylate functions according to the formula H₂C═C(CH₃)—C(O)—O—.

According to another embodiment, the photocrosslinkable compound P1 isof formula:

wherein:

-   -   j is an integer ranging from 1 to 10, preferably equal to 2,    -   R1 and R2, identical or different, represent a hydrogen atom or        a methyl group,    -   R3 and R4, identical or different, represent a hydrogen atom or        a C₁-C₁₀ alkyl chain, preferably a hydrogen atom or a methyl        group, and    -   -A- represents a linear or branched C₁-C₁₀ divalent alkylene        group, or a divalent polyurethane group, comprising from 2 to 20        urethane units.

Preferably, R1 and R2 are methyl groups.

According to another embodiment, the photocrosslinkable compound P1 isof formula (I):

wherein:

-   -   i is an integer ranging from 1 to 6, preferably equal to 2,    -   j is an integer ranging from 1 to 6, preferably equal to i, and        preferentially equal to 2, and    -   R3 and R4, identical or different, represent a hydrogen atom or        a C₁-C₁₀ alkyl chain, preferably a hydrogen atom or a methyl        group.

The photocrosslinkable compound P1 preferably has a dynamic viscositygreater than or equal to 20 Pa·s, preferably less than or equal to 50Pa·s at 20° C.

The dynamic viscosity of the photocrosslinkable compound P1 may bemeasured using a Brookfield rotary viscometer, according to theconventional method specified in the instructions provided by themanufacturer.

The composition according to the invention optionally comprises amixture of different compounds P1.

The compound(s) P1 is (are) preferably present at a total contentgreater than or equal to 1% by weight, in relation to the total weightof the photocrosslinkable composition, advantageously ranging from 1 to20%, preferably from 5 to 15%, preferably from 10 to 15% by weight inrelation to the total weight of the photocrosslinkable composition.

As an example of a suitable photocrosslinkable compound P1, mention maybe made of Isophorone Urethane Dimethacrylate (X-851-1066—ESSTECH,Inc.).

Photocrosslinkable Compound P2

The composition according to the invention comprises at least one secondphotocrosslinkable compound, referred to as P2, which is a urethane(meth)acrylate compound and comprises a polyether chain.

Advantageously, the mean number of (meth)acrylate functions borne by thephotocrosslinkable compounds P2 intended to form, after crosslinking, acrosslinked polymeric network, is greater than 1. Indeed, apolymerizable system consisting of molecules each bearing a single(meth)acrylate function forms, after reacting all of said functions, alinear or branched, and not crosslinked, chain macromolecular system.Only the presence of a certain fraction of molecules bearing at leasttwo (meth)acrylate functions and thus acting as a crosslinking agent issuitable for obtaining a crosslinked polymeric system.

In the implementation of the present invention, the mean number of(meth)acrylate functions per molecule of compound P2 is preferablygreater than or equal to 2, advantageously ranging from 2 to 6,preferably from 2 to 4.

Preferentially, P2 is a urethane dimethacrylate compound.

The term “urethane dimethacrylate compound” refers to any compoundcomprising at least one urethane function —O—C(O)—NH—, and twomethacrylate functions according to the formula H₂C═C(CH₃)—C(O)—O—.

Polyether Chain

The term “polyether chain” refers to a C₁-C₁₀₀ divalent hydrocarbonradical, interspersed with at least two oxygen atoms.

Preferably, the polyether chain of the compound P2 has a molar mass lessthan or equal to 1000 g/mol.

Preferentially, the polyether chain generally comprises less than 50carbon atoms, preferably less than 45 carbon atoms.

According to one alternative embodiment, the polyether chain of the P2photocrosslinkable compound P2 is of formula —[C_(n)H₂O]_(m)—, wherein nis an integer ranging from 1 to 6, preferably equal to 2 or 3, and m isan integer ranging from 2 to 50.

It may thus consist for example of a polyoxymethylene chain according tothe formula —[CH₂O]_(m)—, a poly(ethyleneglycol) chain according to theformula —[CH₂CH₂O]_(m)—, a poly(propyleneglycol) chain according to theformula —[CH₂CH(CH₃)O]_(m)— or a polytetramethyleneglycol chainaccording to the formula —[(CH₂)₄O]_(m)—.

According to one preferred embodiment of this alternative embodiment,the polyether chain is such that n=2 and m ranges from 2 to 20,preferably from 5 to 20.

According to a further alternative embodiment, the polyether chain ofthe photocrosslinkable compound P2 is of formula —[PhO]_(m)—, wherein Phrefers to a phenylene divalent radical, optionally substituted with oneor a plurality of C₁-C₆ alkyls and/or halogen atoms, and m is an integerranging from 2 to 50.

It may thus consist for example of a polyphenylether chain according tothe formula —[C₆H₄O]_(m)- or a poly(p-dimethylphenyl)ether chainaccording to the formula —[(C₆H₂)(CH₃)₂O]_(m)—.

According to one alternative embodiment, the photocrosslinkable compoundP2 is of formula (II):

wherein -A′- represents a C₁-C₁₀₀ divalent hydrocarbon radical,optionally substituted with alkyl groups, said radical beinginterspersed with at least one urethane function —O—C(O)—NH—, at leastone polyether chain as defined above, and optionally with heteroatoms,such as oxygen, nitrogen, sulfur atoms, or saturated, aromatic orheteroaromatic cyclic divalent groups, such as cycloalkylene, arylene orheteroarylene groups.

Within the scope of the present invention, the heteroatoms includeoxygen, nitrogen and sulfur atoms.

According to the present invention, the “alkyl” groups representstraight or branched chain saturated hydrocarbon radicals, comprisingfrom 1 to 10 carbon atoms, preferably from 1 to 6 carbon atoms. Mentionmay particularly be made, when they are linear, of methyl, ethyl,propyl, butyl, pentyl, hexyl, octyl, nonyl and decyl radicals. Mentionmay particularly be made, when they are branched or substituted with oneor a plurality of alkyl radicals, of isopropyl, tert-butyl,2-ethylhexyl, 2-methylbutyl, 2-methylpentyl, 1-methylpentyl and3-methylheptyl radicals.

The “cycloalkene” radical is a non-aromatic saturated or partiallyunsaturated mono-, bi- or tri-cyclic divalent hydrocarbon radical,comprising from 3 to 20 carbon atoms, and preferably from 3 to 10 carbonatoms, such as in particular cyclopropylene, cyclopentylene,cyclohexylene or adamantylene, optionally substituted with alkyl groups,and the corresponding rings containing one or a plurality ofunsaturations.

In this way, within the scope of the present invention, the term“cycloalkylene” also covers “heterocycloalkylene” radicals denotingnon-aromatic saturated or partially unsaturated mono- or bicyclicdivalent radicals, of 3 to 8 carbon atoms, comprising one or a pluralityof heteroatoms chosen from N, O or S.

The term “arylene” refers to a mono or bicyclic aromatic divalenthydrocarbon radical, comprising from 6 to 30, preferably from 6 to 10,carbon atoms. Of the arylene radicals, mention may particularly be madeof the phenylene or naphthylene radical, more particularly substitutedwith at least one halogen atom.

If the arylene radical comprises at least one heteroatom, the term“heteroarylene” radical is used. In this way, the term “heteroarylene”refers to an aromatic divalent radical comprising one or a plurality ofheteroatoms chosen from nitrogen, oxygen or sulfur, comprising from 5 to30, and preferably from 5 to 10, carbon atoms. Of the heteroaryleneradicals, mention may be made of pyrazinylene, thienylene, oxazolylene,furazanylene, pyrrolylene, 1,2,4-thiadiazolylene, naphthyridinylene,pyridazinylene, quinoxalinylene, phtalazinylene,imidazo[1,2-a]pyridinene, imidazo[2,1-b]thiazolylene, cinnolinylene,triazinylene, benzofurazanylene, azaindolylene, benzimidazolylene,benzothienylene, thienopyridylene, thienopyrimidinylene,pyrrolopyridylene, imidazopyridylene, benzoazaindolene,1,2,4-triazinylene, benzothiazolylene, furanylene, imidazolylene,indolylene, triazolylene, tetrazolylene, indolizinylene, isoxazolylene,isoquinolinylene, isothiazolylene, oxadiazolylene, pyrazinylene,pyridazinylene, pyrazolylene, pyridylene, pyrimidinylene, purinylene,quinazolinylene, quinolinylene, isoquinolylene, 1,3,4-thiadiazolylene,thiazolylene, triazinylene, isothiazolylene, carbazolylene, along withthe corresponding groups obtained from the fusion thereof or fusion withthe phenyl nucleus.

According to a further alternative embodiment, the compound P2 is offormula (III):

wherein:

-   -   i is an integer ranging from 1 to 6, preferably equal to 2,    -   j is an integer ranging from 1 to 6, preferably equal to i, and        preferentially equal to 2,    -   m is an integer ranging from 1 to 20,    -   n is an integer between 1 and 10, preferably equal to 1,    -   o is an integer between 1 and 10, preferably equal to 1,    -   R1, R2, R3 and R4, identical or different, represent a hydrogen        atom or a C₁-C₁₀ alkyl chain, preferably a hydrogen atom or a        methyl group, and    -   -A″- represents a linear or branched C₁-C₂₀, divalent        hydrocarbon alkylene group, or a C₅-C₂₀ divalent cycloalkylene        radical.

Preferably, -A″- represents a radical according to the formula:

A photocrosslinkable compound suitable for the implementation of theinvention is for example PEG 400 Extended Urethane Dimethacrylate(X-726-0000—ESSTECH, Inc.).

The compound(s) P2 is (are) preferably present at a total contentgreater than or equal to 1% by weight, in relation to the total weightof the photocrosslinkable composition, advantageously ranging from 1 to20%, preferably from 2 to 15%, preferably from 5 to 10% by weight inrelation to the total weight of the photocrosslinkable composition.

The composition according to the invention optionally comprises amixture of different compounds P2.

Film-Forming Polymer P3

The composition according to the invention comprises at least onefilm-forming polymer P3, different to the photocrosslinkable compound P1and different to the photocrosslinkable compound P2.

The term “film-forming polymer” refers to, according to the invention, apolymer suitable for forming alone (i.e. in the absence of an auxiliaryfilm-forming agent or an external stimulus for example such as UV), afilm suitable for being isolated, particularly a continuous adherentfilm, on a substrate, particularly on nails.

A single film-forming polymer or a mixture of film-forming polymers maybe used.

This film-forming polymer may be chosen from the group consisting ofradical or polycondensate type synthetic polymers, polymers of naturalorigin, and mixtures thereof.

A film-forming polymer suitable for the invention may be chosen frompolysaccharide derivatives, such as cellulose or guar gum derivatives.One preferential polysaccharide derivative suitable for the inventionmay be nitrocellulose or a polysaccharide ester or alkylether.

The term “polysaccharide ester or alkylether” refers to a polysaccharideconsisting of repeat units comprising at least two identical ordifferent rings and having a degree of substitution per saccharide unitbetween 1.9 and 3, preferably between 2.2 and 2.9, and more particularlybetween 2.4 and 2.8. The term substitution refers to thefunctionalization of hydroxyl groups into ester and/or alkyletherfunctions, and/or the functionalization of carboxyl groups into esterfunctions.

In other words, it may consist of a polysaccharide, partially or totallysubstituted with ester and/or alkylether groups. Preferably, thehydroxyl groups may be substituted with C₂-C₄ ester and/or alkyletherfunctions.

Particular mention may be made of cellulose esters (such as celluloseacetobutyrates or cellulose acetopropionates), cellulose alkylethers(such as ethylcelluloses), and ethylguars.

A film-forming polymer suitable for the invention may be chosen fromsynthetic polymers such as polyurethanes, acrylic polymers, vinylpolymers, polyvinylbutyrals, alkyd resins and ketone/aldehyde resins,resins from aldehyde condensation products, such as aryl sulfonamideformaldehyde resins such as toluene sulfonamide formaldehyde resin,aryl-sulfonamide epoxy resins or ethyl tosylamide resins.

In particular, it may consist of(meth)acrylate homopolymers andcopolymers.

A film-forming polymer suitable for the invention may also be chosenfrom polymers of natural origin, such as plant resins such as dammars,elemi, copals, benzoin; gums such as shellac, sandarac and mastic.

As a film-forming polymer, the toluene sulfonamide formaldehyde resins“Ketjentflex MS80” from AKZO or “Santolite MHP”, “Santolite MS 80” fromFACONNIER or “RESIMPOL 80” from PAN AMERICANA, the alkyd resin “BECKOSOLODE 230-70-E” from DAINIPPON, the acrylic resin “ACRYLOID B66” from ROHM& HAAS, the polyurethane resin “TRIXENE PR 4127” from BAXENDEN, theacetophenone/formaldehyde resin marketed under the reference SyntheticResin SK by Degussa may notably be used.

According to one preferred particular embodiment, the film-formingpolymer P3 is chosen from polysaccharides and polysaccharidederivatives, preferably from nitrocellulose and polysaccharide ethersand esters, particularly C₂-C₄, and more preferentially from celluloseacetobutyrates, cellulose acetopropionates, ethylcelluloses, ethylguars,and mixtures thereof.

According to one particularly preferred embodiment, the film-formingpolymer P3 is chosen from nitrocellulose, cellulose acetopropionate,cellulose acetobutyrate, and (meth)acrylate homopolymers and copolymers.

Advantageously, the film-forming polymer P3 is nitrocellulose.

The compositions according to the invention optionally comprise amixture of different film-forming polymers P3.

According to one embodiment, in the composition according to theinvention, the ratio of the total mass of P1 and P2 to the total mass ofP3 is less than or equal to 2.5, preferably ranging from 0.25 to 2.5,preferentially ranging from 0.5 to 2.0.

Photoinitiator

The composition according to the invention comprises at least onephotoinitiator.

The photoinitiators suitable for use according to the present inventionare known in the art and are described, for example in “Lesphotoinitiateurs dans la réticulation des revetements”, G. Li Bassi,Double Liaison—Chimie des Peintures, No. 361, November 1985, p. 34-41;“Applications industrielles de la polymérisation photoinduite”, HenriStrub, L'Actualité Chimiqué, February 2000, p. 5-13; and“Photopolymères: considérations théoriques et réaction de prise”, Marc,J. M. Abadie, Double Liaison—Chimie des Peintures, No. 435-436, 1992, p.28-34.

These photoinitiators include:

-   -   α-hydroxyketones, marketed for example under the names DAROCUR®        1173 and 4265, IRGACURE® 184, 2959, and 500 by BASF, and        ADDITOL® CPK by CYTEC,    -   α-aminoketones, marketed for example under the names IRGACURE®        907 and 369 by BASF,    -   aromatic ketones marketed for example under the name ESACURE®        TZT by LAMBERTI. Mention may also be made of thioxanthones        marketed for example under the name ESACURE® ITX by LAMBERTI,        and quinones. These aromatic ketones generally require the        presence of a hydrogen donor compound such as tertiary amines        and particularly alkanolamines. Mention may particularly be made        by the tertiary amine ESACURE® EDB marketed by LAMBERTI.    -   α-dicarbonyl derivatives of which the most common is benzyl        dimethyl ketal marketed under the name IRGACURE® 651 by BASF.        Further commercial products are marketed by LAMBERTI under the        name ESACURE® KB1, and    -   acylphosphine oxides, such as for example bis-acylphosphine        oxides (BAPO) marketed for example under the names IRGACURE®        819, 1700, and 1800, DAROCUR® 4265, LUCIRIN® TPO, and LUCIRIN®        TPO-L by BASF.

Preferably, the photoinitiator of the composition according to theinvention is chosen from the group consisting of α-hydroxyketones,α-aminoketones, aromatic ketones preferably associated with a hydrogendonor compound, aromatic α-diketones, acylphosphine oxides, and mixturesthereof.

Preferably, the photoinitiator of the composition according to theinvention is chosen from acylphosphine oxides, such as for exampleLUCIRIN® TPO-L (BASF), α-hydroxyketones, such as for example IRGACURE®184 (BASF), and mixtures thereof.

A mixture of photoinitiators absorbing light radiation at variouswavelengths may also be used in the photocrosslinkable compositionaccording to the invention. The absorption spectrum of thephotocrosslinkable composition can thus be adapted to the emissionspectrum of the light sources used.

Preferably, the composition according to the invention comprises amixture of two different photoinitiators, such as for example a mixtureof an α-hydroxyketone and an acylphosphine oxide.

A particular group of photoinitiators suitable for use in thephotocrosslinkable cosmetic compositions according to the presentinvention is that of copolymerizable photoinitiators. It consists ofmolecules comprising both a photoinitiator group capable of photoinducedradical splitting and at least one double ethylene bond. Thephotoinitiators in this group offer the advantage, in relation to theconventional photoinitiators listed above, of being suitable for beingincorporated, via the double bond, into the macromolecular system. Thispossibility reduces the content of free residual photoinitiators nothaving undergone photoinduced radical splitting and thus enhances thesafety of the layer C1.

As examples of such copolymerizable photoinitiators, mention may be madeof benzophenone acrylate derivatives marketed by CYTEC under the namesEBECRYL® P36, EBECRYL® P37.

In one preferred embodiment of the invention, polymer photoinitiators orphotoinitiators bound onto a high molar mass molecule are used. Thechoice of such a high mass photoinitiator offers the same advantage asselecting only polymeric copolymerizable compounds, i.e. enhanced safetyof the photocrosslinkable cosmetic compositions due to the absence ofvery reactive molecules liable to diffuse to neighboring biologicalsubstrates. The mean molar mass by weight of the photoinitiator ispreferably at least equal to 500 g/mol.

For example, mention may be made of an α-hydroxyketone oligomercorresponding to the following formula:

and which is marketed under the name ESACURE® KIP 150 by LAMBERTI.

The polymer on which the photoinitiator group is bound may optionallycomprise one or a plurality of double ethylene bonds for optionallyincorporating, into the macromolecular network, photoinitiator moleculesnot having undergone photoinduced splitting.

As examples of such high molar mass photoinitiators bearing doubleethylene bonds, mention may be made of those corresponding to thefollowing formulae:

These structures are described in the following articles: S. Knaus, PureAppl. Chem., A33(7), 869 (1996); S. Knaus, J. Polym. Sci, Part A=Polym.Chem., 33, 929 (1995); and R. Liska, Rad'Tech Europe 97, Lyon, F, 1997,Conference Proceedings.

The content of the photoinitiator(s) used is dependent on a large numberof factors such as the reactivity of the various constituents of themixture, the presence of pigments or dyes, the crosslinking densitysought, the intensity of the light source or the exposure time.

In order to obtain satisfactory mechanical properties, thephotoinitiator(s) is (or are) preferably present in a total contentgreater than or equal to 0.1% by weight in relation to the total weightof the photocrosslinkable composition, preferably from 1 to 5% by weightin relation to the total weight of the photocrosslinkable composition.

Preferably, the photoinitiator(s) is (or are) present in a total contentgreater than or equal to 0.1% by weight in relation to the total weightof the photocrosslinkable compound(s), preferably from 1% to 15% byweight in relation to the total weight of the photocrosslinkablecompound(s) P1 and P2.

Solvents

The composition according to the present invention generally comprisesat least one solvent chosen from physiologically acceptable organic andinorganic solvents.

The suitable solvents may particularly be chosen from:

-   -   liquid ketones at ambient temperature such as methylethylketone,        methylisobutylketone, diisobutylketone, isophorone,        cyclohexanone and acetone,    -   liquid alcohols at ambient temperature such as ethanol,        isopropanol, diacetone-alcohol, 2-butoxyethanol and        cyclohexanol,    -   liquid glycols at ambient temperature such as ethyleneglycol,        propyleneglycol, pentyleneglycol and glycerol,    -   liquid propyleneglycol ethers at ambient temperature such as        propyleneglycol monomethylether, propyleneglycol monomethyl        ether acetate and dipropyleneglycol mono-n-butylether,    -   short-chain esters (comprising in total from 3 to 8 carbon        atoms) such as ethyl acetate, methyl acetate, propyl acetate,        n-propyl acetate, iso-propyl acetate, n-butyl acetate, iso-butyl        acetate, ter-butyl acetate and isopentyl acetate,    -   liquid alkanes at ambient temperature such as decane, heptane,        dodecane and cyclohexane,    -   liquid aromatic hydrocarbons at ambient temperature such as        toluene and xylene,    -   liquid silicones at ambient temperature, and    -   mixtures thereof.

The composition according to the invention preferably comprisesso-called volatile solvents.

The term “volatile solvent” refers to a solvent capable of evaporatingon contact with keratin matter, in less than one hour, at ambienttemperature and at atmospheric pressure.

The volatile solvent(s) according to the invention are liquid solventsat ambient temperature, having a vapor pressure different to zero, atambient temperature and atmospheric pressure, particularly ranging from0.13 Pa to 40,000 Pa (from 10⁻³ to 300 mm Hg), particularly ranging from1.3 Pa to 13,000 Pa (from 0.01 to 100 mm Hg), and more specificallyranging from 1.3 Pa to 1300 Pa (from 0.01 to 10 mm Hg).

On the other hand, a “non-volatile solvent” evaporates on contact withkeratin matter in more than one hour, at ambient temperature andatmospheric pressure.

The total solvent content in the composition may range from 5% to 95% byweight, in relation to the total weight of the composition.

According to one embodiment, the volatile solvent content in thecomposition ranges from 30% to 80%, preferably from 50% to 70% inrelation to the total weight of said composition.

Preferably, the composition comprises a solvent chosen from liquidalcohols at ambient temperature, such as ethanol and isopropanol, andshort-chain esters comprising in total from 3 to 8 carbon atoms, such asethyl acetate and butyl acetate, and mixtures thereof.

Preferably, the solvent of the composition according to the invention isethyl acetate.

Adjuvants

According to one embodiment, the composition according to the inventionfurther comprises a coloring agent chosen from the group consisting ofsoluble dyes, pigments, nacres and glitter.

The coloring agent(s) may be present in a total content greater than orequal to 0.1% by weight in relation to the total weight of the layer,ranging preferably from 0.1 to 5%, advantageously from 0.2 to 1% byweight in relation to the total weight of the layer.

The term “soluble dyes” should be understood to refer to organic,inorganic or organometallic compounds, soluble in the compositionaccording to the invention and intended to color said composition.

The dyes are, for example, Sudan Red, DC Red 17, DC Green 6, βcarotene,soybean oil, Sudan Brown, DC Yellow 11, DC Violet 2, DC Orange 5, andQuinoline Yellow.

The term “pigments” should be understood to refer to inorganic ororganic, white or colored particles of any shape, insoluble in thecomposition according to the invention and intended to color saidcomposition.

The term “nacres” should be understood to refer to iridescent particlesof any shape, particularly produced by some mollusks in their shell orby synthetic means.

The pigments may be white or colored, inorganic and/or organic. Of theinorganic pigments, mention may be made of titanium dioxide, optionallysurface-treated, zirconium or cerium oxides, along with zinc, iron(black, yellow or red) or chromium oxides, manganese violet, ultramarineblue, chromium hydrate and iron blue, metallic powders such as aluminumpowder, copper powder.

Of the organic pigments, mention may be made of carbon black, D & C typepigments, and lacquers based on cochineal carmine, barium, strontium,calcium, aluminum.

Mention may also be made of effect pigments such as particles comprisinga natural or synthetic organic or inorganic substrate, for exampleglass, acrylic resins, polyester, polyurethane, polyethyleneterephthalate, ceramics, aluminas and optionally coated with metallicsubstances such as aluminum, gold, copper, bronze, or with metal oxidessuch as titanium dioxide, iron oxide, chromium oxide, inorganic ororganic pigments and mixtures thereof.

The pearlescent pigments may be chosen from white pearlescent pigmentssuch as mica coated with titanium, or bismuth oxychloride, coloredpearlescent pigments such as titanium mica coated with iron oxides,titanium mica coated with iron blue and chromium oxide in particular,titanium mica coated with an organic pigments of the aforementioned typeand pearlescent pigments based on bismuth oxychloride.

Pigments with goniochromatic properties may be used, particularly liquidcrystal or multilayer pigments.

Optical brighteners or fibers optionally coated with optical brightenersmay also be used.

The composition according to the invention may further comprise one or aplurality of fillers, particularly at a content ranging from 0.01% to50% by weight, in relation to the total weight of the composition,preferably ranging from 0.01% to 30% by weight.

The term “fillers” should be understood to refer to inorganic orsynthetic colorless or white particles of any shape, insoluble in themedium of the composition regardless of the temperature at which thecomposition is manufactured. These fillers may particularly be used tomodify the rheology or texture of the composition.

The fillers may be mineral or organic particles of any shape, in sheet,spherical or oblong form, regardless of the crystallographic shape (forexample sheet, cubic, hexagonal, orthorhombic, etc). Mention may be madeof talc, mica, silica, kaolin, polyamide (Nylon®) (Orgasol® fromAtochem), poly-alanine and polyethylene powders, tetrafluoroethylenepolymer powders (Teflon®), lauroyl-lysine, starch, boron nitride,polymeric hollow microspheres such as those of polyvinylidenechloride/acrylonitrile like Expancel® (Nobel Industrie), acrylic acidcopolymers (Polytrap® from Dow Corning) and silicone resin microbeads(Tospearls® from Toshiba, for example), elastomer polyorganosiloxaneparticles, precipitated calcium carbonate, magnesium carbonate andhydro-carbonate, hydroxyapatite, hollow silica microspheres (SilicaBeads® from Maprecos), glass or ceramic microcapsules, metallic soapsderived from carboxylic organic acids having 8 to 22 carbon atoms,preferably from 12 to 18 carbon atoms, for example zinc, magnesium orlithium stearate, zinc laurate, magnesium myristate.

The composition according to the invention may also further compriseadjuvants, or additives, particularly chosen from plasticizers,coalescing agents, preservatives, waxes, thickeners, perfumes, UVfilters, cosmetic active substances for nail care, spreading agents,anti-foaming agents and dispersing agents.

Obviously, those skilled in the art will take care to choose theseoptional adjuvants or additives such that the advantageous properties ofthe composition according to the invention are not, or are practicallynot, altered by the envisaged addition.

If the composition comprises pigments and/or dyes, it is particularlyadvisable to adapt the absorption spectrum of the pigments and/or dyesused to that of the photoinitiators, or conversely the absorptionspectrum of the photoinitiators to that of the pigments and/or dyesused, so as to prevent both types of compounds from absorbing light atthe same wavelengths. Indeed, the absorption of light by the pigmentsand/or dyes would render the photoinitiators present beyond a specificdepth of the coat almost completely ineffective.

Preferably, the composition according to the invention is transparent.

As used herein, the term transparent refers to that the composition hasa HAZEBYK index of less than 5 as measured with a KYKHAZEGLOSS typegloss meter.

One particular composition according to the invention comprises, orconsists of:

-   -   from 1% to 20%, preferably from 10% to 15%, of a        photocrosslinkable urethane dimethacrylate compound P1 according        to formula (I) as defined above,    -   from 1% to 20%, preferably from 5% to 10%, of a        photocrosslinkable urethane dimethacrylate compound P2        comprising a poly(ethyleneglycol) chain,    -   from 10% to 30%, preferably from 15% to 25%, of nitrocellulose,    -   from 30% to 80%, preferably from 50% to 70%, of ethyl acetate,        from 0.1% to 5%, preferably from 0.5% to 3.0%, of an        acylphosphine oxide photoinitiator, an α-hydroxyketone        photoinitiator, or of a mixture thereof, and optionally    -   from 0.1% to 5% of a coloring agent,

wherein the percentages are expressed in relation to the total weight ofsaid composition.

The composition according to the invention is typically intended to beused as nail varnish.

As such, the present invention relates to a makeup and/or care method ofa nail and/or false nail, comprising the following steps.

-   -   a) applying, onto a nail or a false nail, a photocrosslinkable        composition according to the invention, whereby a coat        consisting of at least one layer of said photocrosslinkable        composition is deposited, and    -   b) exposing the coated nail or false nail obtained following        step a) to UV or visible light radiation, whereby the        photocrosslinking of the photocrosslinkable compounds P1 and P2        of said composition is carried out.

The radiation suitable for the crosslinking of the photocrosslinkablecomposition according to the present invention has a wavelength rangingfrom 210 to 600 nm, preferably from 250 to 420 nm, preferably from 350to 410 nm. The use of lasers may also be envisaged.

In one preferred embodiment of the invention, a LED lamp or an UV lampand particularly a mercury vapor lamp, optionally doped with furtherelements, such as gallium, suitable for modifying the emission spectrumof the light source, is used.

The exposure time of the deposited coat to radiation is dependent onvarious factors such as the chemical nature and content of the reactivecompounds or the crosslinking density sought.

For nail varnishes, it would generally be sought to obtain satisfactoryresults for an exposure time ranging from 10 seconds to 10 minutes,preferably from 30 seconds to 5 minutes.

Such a method may use a UV lamp having a power of approximately 36 W.

Following the crosslinking step b), the coat deposited on the nail orfalse nail is not tacky and can be touched with a finger without leavingmarks or damaging said coat. It is thus not necessary to perform anycleaning of the crosslinked coat, which saves time and facilitates usecompared to the photocrosslinkable compositions currently on the market.

Preferably, the method according to the invention does not comprise acleaning step after the crosslinking step b).

Without seeking to be associated with a particular theory, this lack oftack means that the surface of the coat is free from unreactedphotocrosslinkable compounds which may be harmful for the adjacent orunderlying nail substrates.

According to one embodiment, the method according to the inventionfurther comprises, before step b), a period for drying the coatdeposited following step a), the duration whereof may vary from 1 to 20minutes, typically from 5 to 15 minutes. Said drying is generallyperformed in air and at ambient temperature.

A particular method according to the invention solely consists of a stepa) and a step b) as defined above, optionally at an interval of a dryingperiod as defined above.

According to one embodiment, after the crosslinking step b), the coatdeposited on the nail is coated with at least one layer of a finishingcomposition, also known as a “top-coat”, said finishing compositionbeing optionally crosslinkable.

Preferably, the thickness after drying the coat of photocrosslinkablecomposition deposited in step a) is less than or equal to 100 μm,preferably less than or equal to 50 μm.

The crosslinked coat obtained from the crosslinking in step b) exhibitsa significant stability over time, in terms of chipping resistance andgloss, particularly over the course of at least one week. It thus provesto be resistant to water, friction and shocks, and does not exhibitsignificant wear or chipping in this interval.

This coat is also capable of being solubilized or increasing in volumeand thus weight when placed in contact with a standard makeup removalsolvent. This ability to be solubilized or swell, displayed by thecrosslinked coat, is specifically advantageous for the removal thereofwhen applied onto the surface of a nail or false nail. Indeed, the coatmay be removed readily merely by means of makeup removal using aconventional solvent.

In this way, the composition according to the invention isadvantageously suitable for being removed using standard solvents usedin the field of nail varnish, and particularly using acetone and ethylacetate, and mixtures thereof.

The present invention also relates to a makeup removal method of a nailand/or false nail, comprising the application of a makeup removalcomposition, such as a standard solvent described above, onto a nail orfalse nail coated with at least one layer obtained by crosslinking alayer of composition according to the invention, whereby saidcrosslinked layer is removed.

The present invention also relates to a kit comprising:

-   -   a photocrosslinkable cosmetic composition according to the        invention,    -   an abrasive material having a granulometry greater than or equal        to 200 μm, preferably less than 300 μm, advantageously comprised        from 220 μm to 280 μm, and    -   a LED lamp or an UV lamp.

The present invention also relates to a makeup and/or care method of anail and/or false nail, comprising the following steps:

-   -   i) rubbing the surface of a nail or false nail with an abrasive        material having a granulometry greater than or equal to 200 μm,        preferably less than 300 μm, advantageously comprised from 220        μm to 280 μm,    -   ii) applying a photocrosslinkable composition according to the        invention onto the surface of the nail or false nail which has        been rubbed following step i), whereby a coat consisting of at        least one layer of said photocrosslinkable composition is        deposited, and    -   iii) exposing the coated nail or false nail obtained following        step ii) to a LED lamp or an UV lamp, whereby the        photocrosslinking of the photocrosslinkable composition is        carried out.

Usually, the rubbing step is performed for less than 10 seconds,preferably less than 5 seconds, for example for approximately 3 seconds.

EXAMPLES

The present invention will now be illustrated using the followingexample.

A colored photocrosslinkable composition according to the invention(composition No. 1) is applied onto nails. After drying forapproximately 10 minutes, the nail coated with the photocrosslinkablecomposition is then crosslinked for 60 seconds under an “OPI GelColor”lamp from OPI (wavelength: 404 nm).

Composition No. 1 (ratio (P1+P2)/P3=2 with 59% ethyl acetate)

Isophorone Urethane Dimethacrylate 13.5%   (X-851-1066-ESSTECH, Inc.)PEG 400 Extended Urethane Dimethacrylate  9% (X-726-0000-ESSTECH, Inc.)Nitrocellulose with 30% isopropyl alcohol (viscosity: E22-1/2s) 16%Ethyl acetate 59% Red 7 lacquer 0.5%  (Sunchroma D&C red 7-Sun)Ethyl-2,4,6-Trimethylbenzoylphenylphosphinate  2% photoinitiator(Lucirin TPO-L-BASF)

Nitrocellulose, ethyl acetate and pigment are introduced into acontainer and placed under stirring with a Rayneri laboratory mixeruntil a homogeneous mixture is obtained. An aluminum foil will have beenpreviously positioned on the top of the container to prevent thesolvents from evaporating. The mixture is then introduced into aDyno-mill type laboratory bead mill so as to obtain a homogeneous color.

The mixture obtained is then introduced into a light-opaque bottle. The“Ethyl-2,4,6-Trimethylbenzoylphenylphosphinate” photoinitiator is thenintroduced into the opaque bottle and mixed using a bar magnet for 1hour. The “Isophorone Urethane Dimethacrylate” and “PEG 400 ExtendedUrethane Dimethacrylate” compounds are then introduced into the opaquebottle. The mixture obtained is then placed under stirring using a barmagnet for 1 hour.

The surface of the crosslinked coat is not tacky and does not need to becleaned with isopropanol.

Optionally, the coat may be coated with a finishing layer, with ESSIE“Good to go” composition.

COMPARATIVE EXAMPLES

Each of compositions No. 2 and No. 3 hereinafter is applied to thenails. After drying for approximately 10 minutes, the coats arecrosslinked for 60 seconds under the “OPI GelColor” lamp from OPI.

Composition No. 2 (ratio (P1+P2)/P3=5 with 34.5% ethyl acetate)

Isophorone Urethane Dimethacrylate 29.40% (X-851-1066-ESSTECH, Inc.) PEG400 Extended Urethane Dimethacrylate 19.60% (X-726-0000-ESSTECH, Inc.)Nitrocellulose with 30% isopropyl alcohol (viscosity: E22-1/2s)   14%Ethyl acetate  34.5% Red 7 lacquer  0.5% (Sunchroma D&C red 7-Sun)Ethyl-2,4,6-Trimethylbenzoylphenylphosphinate    2% photoinitiator(Lucirin TPO-L-BASF)

Nitrocellulose, ethyl acetate and pigment are introduced into acontainer and placed under stirring with a Rayneri laboratory mixeruntil a homogeneous mixture is obtained. An aluminum foil will have beenpreviously positioned on the top of the container to prevent thesolvents from evaporating. The mixture is then introduced into aDyno-mill type laboratory bead mill so as to obtain a homogeneous color.

The mixture obtained is then introduced into a light-opaque bottle. The“Ethyl-2,4,6-Trimethylbenzoylphenylphosphinate” photoinitiator is thenintroduced into the opaque bottle and mixed using a bar magnet for 1hour. The “Isophorone Urethane Dimethacrylate” and “PEG 400 ExtendedUrethane Dimethacrylate” compounds are then introduced into the opaquebottle. The mixture obtained is then placed under stirring using a barmagnet for 1 hour.

Composition No. 3 (ratio (P1+P2)/P3=2 with 59% butyl acetate)

Isophorone Urethane Dimethacrylate 13.5%   (X-851-1066-ESSTECH, Inc.)PEG 400 Extended Urethane Dimethacrylate  9% (X-726-0000-ESSTECH, Inc.)Nitrocellulose with 30% isopropyl alcohol (viscosity: E22-1/2s) 16%Butyl Acetate 59% Red 7 lacquer 0.5%  (Sunchroma D&C red 7-Sun)Ethyl-2,4,6-Trimethylbenzoylphenylphosphinate  2% photoinitiator(Lucirin TPO-L-BASF)

Nitrocellulose, butyl acetate and pigment are introduced into acontainer and placed under stirring with a Rayneri laboratory mixeruntil a homogeneous mixture is obtained. An aluminum foil will have beenpreviously positioned on the top of the container to prevent thesolvents from evaporating. The mixture is then introduced into aDyno-mill type laboratory bead mill so as to obtain a homogeneous color.

The mixture obtained is then introduced into a light-opaque bottle. The“Ethyl-2,4,6-Trimethylbenzoylphenylphosphinate” photoinitiator is thenintroduced into the opaque bottle and mixed using a bar magnet for 1hour. The “Isophorone Urethane Dimethacrylate” and “PEG 400 ExtendedUrethane Dimethacrylate” compounds are then introduced into the opaquebottle. The mixture obtained is then placed under stirring using a barmagnet for 1 hour.

After drying for 10 min followed by crosslinking for 60 seconds underthe “OPI Gelcolor” lamp, the films from both comparative compositionsNo. 2 and No. 3 above have a tacky surface.

1. Photocrosslinkable cosmetic composition, comprising in aphysiologically acceptable medium: at least one photocrosslinkableurethane (meth)acrylate compound P1 comprising at least one structuralunit:

at least one photocrosslinkable urethane (meth)acrylate compound P2comprising at least one polyether chain, said compound having a molarmass greater than or equal to 1000 g/mol, at least one film-formingpolymer P3, at least one photoinitiator, and at least one volatilesolvent chosen from acetone, ethyl acetate, and propyl acetate, saidsolvent being present in said composition at a content greater than orequal to 20%, preferably greater than or equal to 30%, by weight inrelation to the total weight of said composition, wherein the ratio ofthe total mass of P1 and P2 to the total mass of P3 is less than orequal to 4.0.
 2. Composition according to claim 1, wherein P1 is aurethane dimethacrylate compound.
 3. Composition according to any ofclaims 1 and 2, wherein P1 is of formula (I):

wherein: i is an integer ranging from 1 to 6, j is an integer rangingfrom 1 to 6, and R′₁, R′₂, R′₃, et R′₄, identical or different,represent a hydrogen atom or a C₁-C₁₀ alkyl chain, preferably a hydrogenatom or a methyl group
 4. Composition according to any of claims 1 to 3,wherein P1 has a dynamic viscosity greater than or equal to 20 Pa·s at20° C.
 5. Composition according to any of claims 1 to 4, wherein P2 isof formula (III):

wherein: i is an integer ranging from 1 to 6, preferably equal to 2, jis an integer ranging from 1 to 6, preferably equal to i, andpreferentially equal to 2, m is an integer ranging from 1 to 20, n is aninteger between 1 and 10, preferably equal to 1, o is an integer between1 and 10, preferably equal to 1, R1, R2, R3, and R4, identical ordifferent, represent a hydrogen atom or a C₁-C₁₀ alkyl chain, preferablya hydrogen atom or a methyl group, and -A″- represents a linear orbranched C₁-C₂₀ divalent alkylene group, or a C₅-C₂₀ divalentcycloalkylene radical.
 6. Composition according to any of claims 1 to 5,wherein the polyether chain of P2 has a molar mass less than or equal to1000 g/mol.
 7. Composition according to any of claims 1 to 6, whereinthe polyether chain of P2 is of formula —[C_(n)H_(2n)O]_(m)—, wherein nis an integer ranging from 1 to 6 and m is an integer ranging from 2 to50.
 8. Composition according to claim 7, wherein n=2 and m ranges from 2to
 20. 9. Composition according to any of claims 1 to 8, wherein P3 ischosen from the group consisting of nitrocellulose, celluloseacetopropionate, cellulose acetobutyrate, and (meth)acrylatehomopolymers and copolymers.
 10. Composition according to any of claims1 to 9, wherein P3 is nitrocellulose.
 11. Composition according to anyof claims 1 to 10, wherein the ratio of the total mass of P1 and P2 tothe total mass of P3 is less than or equal to 2.5, preferably rangingfrom 0.25 to 2.5, preferentially ranging from 0.5 to 2.0. 12.Composition according to any of claims 1 to 11, wherein thephotoinitiator is chosen from the group consisting of α-hydroxyketones,α-aminoketones, aromatic ketones preferably associated with a hydrogendonor compound, aromatic α-diketones, and acylphosphine oxides. 13.Composition according to any of claims 1 to 12, wherein the volatilesolvent content by weight in said composition ranges from 30% to 80%,preferentially from 50% to 70%, in relation to the total weight of thecomposition.
 14. Composition according to any of claims 1 to 13, furthercomprising a coloring agent chosen from the group consisting of solubledyes, pigments, nacres and glitter.
 15. Composition according to any ofclaims 1 to 14, comprising: from 1% to 20% by weight of aphotocrosslinkable urethane dimethacrylate compound P1 according toformula (I) as defined in claim 3, from 1% to 20% by weight of aphotocrosslinkable urethane dimethacrylate compound P2 comprising apoly(ethyleneglycol) chain, from 10% to 30% by weight of nitrocellulose,from 30% to 80% by weight of ethyl acetate, and from 0.1% to 5% byweight of an acylphosphine oxide photoinitiator, an α-hydroxyketonephotoinitiator, or a mixture thereof, wherein the percentages areexpressed in relation to the total weight of said composition. 16.Composition according to any of claims 1 to 15, wherein the proportionof (meth)acrylate monomers is less than or equal to 10% by weight inrelation to the total weight of said composition.
 17. Makeup and/or caremethod of a nail and/or false nail, comprising the following steps: a)applying, onto a nail or a false nail, a photocrosslinkable compositionaccording to any of claims 1 to 16, whereby a coat consisting of atleast one layer of said photocrosslinkable composition is deposited, andb) exposing the coated nail or false nail obtained following step a) toUV or visible light radiation, whereby the photocrosslinking of thephotocrosslinkable compounds P1 and P2 of said composition is carriedout.
 18. Kit comprising: a photocrosslinkable cosmetic compositionaccording to any one of claims 1 to 16, an abrasive material having agranulometry greater than or equal to 200 μm, preferably less than 300μm, advantageously comprised from 220 μm to 280 μm, and a LED lamp or anUV lamp.
 19. Makeup and/or care method of a nail and/or false nail,comprising the following steps: i) rubbing the surface of a nail orfalse nail with an abrasive material having a granulometry greater thanor equal to 200 μm, preferably less than 300 μm, advantageouslycomprised from 220 μm to 280 μm, ii) applying a photocrosslinkablecomposition according to any one of claims 1 to 16 onto the surface ofthe nail or false nail which has been rubbed following step i), wherebya coat consisting of at least one layer of said photocrosslinkablecomposition is deposited, and iii) exposing the coated nail or falsenail obtained following step ii) to a LED lamp or an UV lamp, wherebythe photocrosslinking of the photocrosslinkable composition is carriedout.